| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Paul Bonoli |
| Physics operator(s): | Jim Irby |
| Engineering operator(s): | Bill Parkin,Ed Fitzgerald,Bill Byford |
| Engineering Operator Run Comment |
| Continuation of MP #277A Internal transport barrier studies at 4.5 T wit |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:26:087PM |
| Author: To Be Determined |
| Run Summary for Wednesday December 20, 2000 MP 277A: Internal Transport Barrier Studies at 4.5T with Simultaneous Central and Off-axis ICRF Heating 1001220 Physics Operator: Jim Irby Session Leader: Paul Bonoli _______________________________________________________________________________ _______________________________________________________________________________ Run Summary This was a very successful run day in several respects. First we learned that in order to reliably produce the density barrier mode with off-axis ICRF heating only, it is important to have a high enough target density, in this case nl_04 = 1.0 X 10^20. Using the higher target density (see shots 013-024) produces a sustained EDA H-mode phase with an early L->H transition at (0.7-0.8) sec., and void of any back (H->L) transitions. The density increases were quite strong in many of these plasmas with ne0 (from Thomson scattering) rising to 8 X 10^20. The density profiles as measured from visible bremsstrahlung also exhibited clear peaking. The process through which we established reliable density barrier mode formation was as follows: On shots 001-003 the off-axis ICRF heating power was brought up to 2 MW and a density barrier was produced on shot 003 following an early transition to a sustained EDA H-mode. However, shot 003 experienced a late disruption after which early transition to a sustained EDA H-mode could not be achieved (shots 004 - 006). After various attempts to get back the sustained EDA phase, such as discharge cleaning between shots, changing the timing of the J-port power, changing the level of the 80 MHz off-axis heating power, and changing the triangularity, it was decided on shots 012 and 013 to raise the target density (nl_04) by about 40% to 1.0 X 10^20. This worked very well. The H/D ratio remained at about 0.04 for the remainder of the run. We were also able to heat with the 70 MHz J-port power during the density barrier phase, at different rf power levels and at different times. Increases in the neutron rate and central T_i were produced by injecting J-port power later in the discharge (1.25 - 1.5 sec) after the density barrier forms (see shots 016-019). We were able to scan the on-axis 70 MHz power from 0.8 - 1.2 MW in these plasmas. The increase in neutron rate was found to increase with increasing on-axis heating power (as expected). The density increase during barrier formation was found to be arrested by the injection of J-port power at 1.25 - 1.5 sec (see shots 016 and 019). Interstingly enough, on some shots the density increase was also found to continue during J-port heating (see shot 018 for example). Thus it seems that the on-axis heating causes the density barrier to "leak" under certain plasma conditions (but not every shot). A scan of the radial position of the HIREX diagnostic was also carried out on shots 019-024 to get data for T_i and plasma rotation profiles during on-axis heating of the density barrier mode. The J-port power was also injected from 1.25 - 1.5 sec during the HIREX position scan.The data obtained during this day of running should be adequate to carry out a careful transport analysis, in order to determine if heating inside a thermal energy barrier was occurring in these plasmas. A good example of on-axis heating by J-port in a sustained EDA H-mode with no density barrier can be found in shot 015. In this plasma, 0.8 MW of J-port power was overlapped with the 80 MHz power from 0.7 - 1.5 sec. Clear indications of central heating can be seen in the electron temperature increase on the central GPC channel (which was not cut-off in this case). The neutron rate also increases during this phase. During shots 016-025 the total injected ICRF power was in the range 2.8 - 3.2 MW. The J-port antenna system ran very well all day, coupling 0.8 - 1.2 MW into plasma reliably. The 80 MHz, D and E antenna systems also worked well coupling 2 MW total into plasma. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:12:910PM |
| Author: To Be Determined |
| Engineering setup for run 1001220 Continuation of MP #277A Internal Transport Barrier Studies at 4.5 T with Simultaneous and Off-Axis ICRF Heating SL : Bonoli EOs : Byford, Parkin, Fitzgerald PO : Irby ECDC in D2 overnight Power systems as on 1001215024 Gas setup: fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid DISABLED fill B-side upper with 35 psi of D2 Hybrid DISABLED, for ECDC fill C-side with 30 psi of D2 Hybrid enabled leave J-bot as is Hybrid DISABLED Be prepared for between shot ECDC Enable the following gate valves: ECE, VUV RF Setup: XMTRs 1,2, and 4 should be made ready for operation by 8:00 Run starts at 09:00 and ends at 17:00. Summary ------- Machine ran extremely well today with 100% startup. RF was beautiful also. Following shot 3, we had some difficulty getting the machine back into a continuous eda mode. After several shots with veriations in ECDC between shots, small changes to triangularity, and a small tweak to the density, we increased the density from 0.7 to 1e20 NL04 on shot 14 and got a good EDA mode with barrier formation. I think we made good progress on mp277a today. Problems -------- On shot 14 we had the noise problem again in one of the TF converters. Causes 1 kA noise level on TF bus current. I used a startup shot from before Ian fixed various offsets. Should load from a shot from last Friday to get the offsets. Big injection on shot 22 caused disruption and OH crowbar. No fuses lost. Score ----- plasmas 25 fizzles 00 duds 00 Details ------- 1001220xxx irby PHYSICS_OPERATOR Dec 20 2000 8:45:27:593AM . . . . . . . . . . . . . . . . . . . . Did REMCAM Did coldstart: rtnode -- data loaded, A matrix responds rtnode -- data loaded, M matrix responds rtnode -- data loaded, PID matrix responds RT_NODE Done 20-DEC-2000 07:47:43.57 Loaded shot 1001214015 into segment 02 Loaded shot 1001219015 into segment 01 Argon enabled for the first shot from 0.350 to 0.390 s ---------------------------------------------------------------------------- 1001220001 irby PHYSICS_OPERATOR Dec 20 2000 9:10:12:576AM . . . . . . . . . . . . . . . . . . . . Plasma to rampdown All antennas running gas looks good, bz?? current rise close to yesterday's HtoD 4% ---------------------------------------------------------------------------- 1001220002 irby PHYSICS_OPERATOR Dec 20 2000 9:21:05:436AM . . . . . . . . . . . . . . . . . . . . Repeat with more RF power Plasma to rampdown RF looks great ---------------------------------------------------------------------------- 1001220003 irby PHYSICS_OPERATOR Dec 20 2000 9:38:47:903AM . . . . . . . . . . . . . . . . . . . . Repeat loast plasma at 1.38 s, injection or two ---------------------------------------------------------------------------- 1001220004 irby PHYSICS_OPERATOR Dec 20 2000 9:55:13:373AM . . . . . . . . . . . . . . . . . . . . Repeat PCS Longer j-port RF plasma to rampdown, but multiple h-modes ---------------------------------------------------------------------------- 1001220005 irby PHYSICS_OPERATOR Dec 20 2000 10:16:17:670AM . . . . . . . . . . . . . . . . . . . . Repeat, but allowing 15 minutes after last shot -- a little better cleanup from disruption (shot 03) Plasma to rampdown, fewer h-mode transitions ---------------------------------------------------------------------------- 1001220006 irby PHYSICS_OPERATOR Dec 20 2000 10:32:53:060AM . . . . . . . . . . . . . . . . . . . . Raised NL_Zmeter by about 10% from 0.32 to 0.36 --- try to get into eda sooner Plasma to 1.52 s --- only one extra h-mode transition --- looks much better gas getting a little high ---------------------------------------------------------------------------- 1001220007 irby PHYSICS_OPERATOR Dec 20 2000 10:54:58:686AM . . . . . . . . . . . . . . . . . . . . Reduced prepuff by 2 ms ECDC in D2 at 2e-4 Torr for 5 minutes Reduced argon puff by 5 ms Plasma to rampdown Still had elm-free period early --- Wolfe now suggesting triangularity adjustment ---------------------------------------------------------------------------- 1001220008 irby PHYSICS_OPERATOR Dec 20 2000 11:19:51:543AM . . . . . . . . . . . . . . . . . . . . 5 minutes of ECDC again Decreased RXU a little from 0.4 s to 0.678 s to increase triangularity Plasma to rampdown, but still two transitions ---------------------------------------------------------------------------- 1001220009 irby PHYSICS_OPERATOR Dec 20 2000 11:37:02:843AM . . . . . . . . . . . . . . . . . . . . Repeat PCS but now with j-port during whole RF period Note that HtoD has been creeping up: last shot 5-6% Plasma to rampdown --- looks like j-port helped --- will extend it next shot ---------------------------------------------------------------------------- 1001220010 irby PHYSICS_OPERATOR Dec 20 2000 11:55:16:263AM . . . . . . . . . . . . . . . . . . . . Extended j-port pulse width across entire RF pulse plasma to rampdown; still have back transition ---------------------------------------------------------------------------- 1001220011 irby PHYSICS_OPERATOR Dec 20 2000 12:07:07:746PM . . . . . . . . . . . . . . . . . . . . Repeat PCS --- Reduce d and e power: assume that too much RF power is generating impurities (moly). Moly killing us faster than we can increase RF power. plasma, transitions worse ---------------------------------------------------------------------------- 1001220012 irby PHYSICS_OPERATOR Dec 20 2000 12:35:37:716PM . . . . . . . . . . . . . . . . . . . . Bring power back up and raise density NL_Zmeter from 0.36 to 0.7 Asked for 10 minutes of ECDC for this shot Init started about 20 minutes after last shot Plasma to rampdown, but I forgot to load the density change!!! ---------------------------------------------------------------------------- 1001220013 irby PHYSICS_OPERATOR Dec 20 2000 1:02:20:606PM . . . . . . . . . . . . . . . . . . . . Loaded density changed I claimed for shot 11 Have asked for ECDC between every shot from shot 12 on --- 5 minutes D2 Plasma to rampdown. Got higher target density. Beautiful EDA but didn't have d-port RF --- tuning?? ---------------------------------------------------------------------------- 1001220014 irby PHYSICS_OPERATOR Dec 20 2000 1:25:23:000PM . . . . . . . . . . . . . . . . . . . . Repeat PCS plasma to 1.85 s One EDA h-mode with ITB formation --- things are looking up Next shot will add j-port again ---------------------------------------------------------------------------- 1001220015 irby PHYSICS_OPERATOR Dec 20 2000 1:55:39:310PM . . . . . . . . . . . . . . . . . . . . Only change is addition of j-port power plasma to 1.75 s, nice eda h-mode, very little peaking of density --- j-port?? Very clean 2.8 MW RF pulse ---------------------------------------------------------------------------- 1001220016 irby PHYSICS_OPERATOR Dec 20 2000 2:10:58:576PM . . . . . . . . . . . . . . . . . . . . Increased argon puff by 5 ms plasma to 1.57 s good eda with increasing peaking until j-port turned on ---------------------------------------------------------------------------- 1001220017 irby PHYSICS_OPERATOR Dec 20 2000 2:32:44:543PM . . . . . . . . . . . . . . . . . . . . Repeat with more j-port power plasma to 1.75 s faults on j HtoD under control; 5% or so ---------------------------------------------------------------------------- 1001220018 irby PHYSICS_OPERATOR Dec 20 2000 2:45:32:983PM . . . . . . . . . . . . . . . . . . . . More j-port plasma to 1.61 s nice h-mode, peaking looks good, nice RF power all antennas ---------------------------------------------------------------------------- 1001220019 irby PHYSICS_OPERATOR Dec 20 2000 3:15:52:326PM . . . . . . . . . . . . . . . . . . . . A little more j-port power plasma to 1.59 3.2 MW RF --- nice clean RF all antennas Instability seems to kill neutron rate at "last" sawtooth. x-ray centroids oscillate at +- 1-2 cm level. ---------------------------------------------------------------------------- 1001220020 irby PHYSICS_OPERATOR Dec 20 2000 3:32:53:890PM . . . . . . . . . . . . . . . . . . . . Next several shots will be Ti profile measurements Plasma to 1.73 s HtoD 4 to 5% ---------------------------------------------------------------------------- 1001220021 irby PHYSICS_OPERATOR Dec 20 2000 3:52:39:093PM . . . . . . . . . . . . . . . . . . . . Plasma for 1.52 s, saw a UFO on wide angle view at end beautiful RF pulses: 3 MW 4 to 5% HtoD Locked mode alert at 1.4 s ---------------------------------------------------------------------------- 1001220022 irby PHYSICS_OPERATOR Dec 20 2000 4:22:09:200PM . . . . . . . . . . . . . . . . . . . . plasma to 1.31 s, big injections at 1.18 and 1.28 s ---------------------------------------------------------------------------- 1001220023 irby PHYSICS_OPERATOR Dec 20 2000 4:32:14:920PM . . . . . . . . . . . . . . . . . . . . plasma to 1.75 s, but lost eda by 1.29 s with injection/impurity increase. ---------------------------------------------------------------------------- 1001220024 irby PHYSICS_OPERATOR Dec 20 2000 4:54:53:576PM . . . . . . . . . . . . . . . . . . . . plasma to 1.43 s got some j-port info ---------------------------------------------------------------------------- 1001220025 irby PHYSICS_OPERATOR Dec 20 2000 5:02:24:640PM . . . . . . . . . . . . . . . . . . . . j-port on earlier (1 s) plasma to 1.76 s d and e power too low to get h-mode, h-mode at 1 s with j-port |
| Session Leader Comments | |||
| Dec 20 2000 09:12:41:547AM | 1001220001 | Paul Bonoli | 1001220001 First, produce the density barrier alone with off-axis ICRF at 80 MHz Step D & E powers up over a few shots and tune J-port Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.8 - 1.4 sec. (0.50 MW) E-port on from 0.8 - 1.4 sec. (0.50 MW) J-port turned on early (0.55-0.65) sec. Result: Got a nice EDA H-mode (transition at 0.85 sec) No TS for density on this shot. There may have been some density peaking about 1.32 sec., where central GPC get cut-off. D & E ran well (1 MW total power) J ran at 400 kW. Extend D & E pulses and increase their power to 1.5 MW total on next shot |
| Dec 20 2000 09:29:47:373AM | 1001220002 | Paul Bonoli | 1001220002 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (0.75 MW) E-port on from 0.7 - 1.5 sec. (0.75 MW) J-port turned on early (0.55-0.65) sec. (0.6 MW) Result: Got a nice EDA H-mode with a transition at 0.76 sec and W_mhd = 85 kJ Got a nice density barrier at 1.35 sec.- ne0_TS = 6.0 X 10^20 and NROOT_zeff = 5.4 X 10^20 D & E ran well (1.5 MW total power) J ran at 600 kW. Increase D & E to 2.0 MW total on next shot |
| Dec 20 2000 09:40:18:140AM | 1001220003 | Paul Bonoli | 1001220003 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (1.00 MW) E-port on from 0.7 - 1.5 sec. (1.00 MW) Overlapped J-port power from 0.7-0.85 sec. to get an H-mode tune Result: Got a nice EDA H-mode with a transition at 0.73 sec Late disruption at 1.39 sec. Got some denity peaking with ne0_TS = 5.5 X 10^20 Neutron rate increased to 8 X 10^12 during J-port injection D had faults but E-port ran nicely J ran at 800 kW. |
| Dec 20 2000 10:08:15:733AM | 1001220004 | Paul Bonoli | 1001220004 Turn J-port on from 1.3-1.5 sec to heat the density barrier mode. Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (0.90 MW) E-port on from 0.7 - 1.5 sec. (1.00 MW) Turn J-port on from 1.3-1.5 sec. (800 kW) Result: Got a multiple EDA H-modes with first transition at 0.89 sec No density peaking. D, E, and J ran nicely. Take this shot over again - maybe the disruption on shot 003 did something. |
| Dec 20 2000 10:18:30:090AM | 1001220005 | Paul Bonoli | 1001220005 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (0.90 MW) E-port on from 0.7 - 1.5 sec. (1.00 MW) Turn J-port on from 1.3-1.5 sec. (800 kW) Result: Got three H-mode transitions with first transition at 0.72 sec. First transition is to an ELM-free phase rather than EDA however. No density peaking. D, E, and J ran nicely. Take this shot over again with a 10% higher target density- need to get rid of the early ELM-free phase. |
| Dec 20 2000 10:36:17:263AM | 1001220006 | Paul Bonoli | 1001220006 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (0.90 MW) E-port on from 0.7 - 1.5 sec. (1.00 MW) Turn J-port on from 1.3-1.5 sec. (800 kW) Result: Better - got an ELM-free transition at 0.72 sec and an EDA transition at 0.92 sec. Late disruption also at 1.53 sec. Some density peaking again (from ne0_TS). High voltage trip on HIREX D, E, and J ran nicely. Take this shot over again with ECDC between shots 006 and 007 |
| Dec 20 2000 11:03:56:483AM | 1001220007 | Paul Bonoli | 1001220007 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (0.90 MW) E-port on from 0.7 - 1.5 sec. (1.00 MW) Turn J-port on from 1.3-1.5 sec. (800 kW) Result: Similar to shot 006 - got an ELM-free phase and then an EDA at 0.95 sec. There is some evidence of density peaking later in the discharge around 1.3 sec where ne0_TS increases to 6.0 X 10^20. Interestingly, this is also where J-port power turns on. D had two trips but E and J ran nicely. Take this shot over again with 5 min. of ECDC and increased triangularity. Also increase J-port power to 1 MW. |
| Dec 20 2000 11:20:13:640AM | 1001220008 | Paul Bonoli | 1001220008 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (0.90 MW) E-port on from 0.7 - 1.5 sec. (1.00 MW) Turn J-port on from 1.3-1.5 sec. (1 MW) Result: Not very good - got an ELM-free transition and an EDA later. Reproduce shots 001-003 where J-port was turned on early and we got an early EDA. Apply 800 kW of J-port power from 0.7 - 0.9 sec and later from 1.3 - 1.5 sec. |
| Dec 20 2000 11:41:47:983AM | 1001220009 | Paul Bonoli | 1001220009 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (1.00 MW) E-port on from 0.7 - 1.5 sec. (1.10 MW) Turn J-port on from 1.3-1.5 sec. (0.8 MW) Result: This looked better - the initial transition to EDA came earlier and then a back transition occurred after J-port turned off. Got good central heating (neutron increase and central GPC) with J-port on. Keep J-port on at 800 kW for 0.7 to 1.5 sec. on next pulse. |
| Dec 20 2000 11:57:02:250AM | 1001220010 | Paul Bonoli | 1001220010 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (1.00 MW) E-port on from 0.7 - 1.5 sec. (1.10 MW) Turn J-port on from 0.7-1.5 sec. (0.8 MW) Result: Got two long EDA phases, but the impurities were accumulating. Got good central heating (neutron increase and central GPC) with J-port on. Need to make the plasma more EDA - like. Try to mitigate the imputity accumulation by backing off on 80 MHz power and turning J-port off. |
| Dec 20 2000 12:31:27:170PM | 1001220011 | Paul Bonoli | 1001220011 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (0.75 MW) E-port on from 0.7 - 1.5 sec. (0.75 MW) Turn J-port off Result: Not good - got multiple H-mode transitions. Try to coax the EDA by increasing density, also turn on ECDC for 10 minutes. Turn D, E, and J-port powers back on. |
| Dec 20 2000 12:34:14:047PM | 1001220012 | Paul Bonoli | 1001220012 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (1.00 MW) E-port on from 0.7 - 1.5 sec. (1.00 MW) Turn J-port on from 0.7-1.5 sec (800 kW) Result: Forgot to load shot (didn't get higher density) - whoops ! Take shot again |
| Dec 20 2000 01:09:50:140PM | 1001220013 | Paul Bonoli | 1001220013 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (1.00 MW) E-port on from 0.7 - 1.5 sec. (1.00 MW) Turn J-port on from 0.7-1.5 sec (800 kW) Result: Got a nice long EDA H-mode with transition at 0.7 sec - finally !!! D-port didn't fire but E and J ran nicely. No TS this shot. Appears not to be any density peaking. Retune D, E, and J antennas and take shot over again. |
| Dec 20 2000 01:29:33:793PM | 1001220014 | Paul Bonoli | 1001220014 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (1.00 MW) E-port on from 0.7 - 1.5 sec. (1.00 MW) Turn J-port on from 0.7-1.5 sec (800 kW) Result: Got a long EDA H-mode phase again and a late disruption (1.55 sec). D and E ports ran with about 1.8 MW coupled power. J-port had faults and tripped out. ne0_TS = 7.5 X 10^20 near end of pulse - a density barrier again. Retune J-port and take shot again |
| Dec 20 2000 02:08:35:873PM | 1001220015 | Paul Bonoli | 1001220015 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (1.00 MW) E-port on from 0.7 - 1.5 sec. (1.00 MW) Turn J-port on from 0.7-1.5 sec (800 kW) Result: Got a long EDA H-mode phase again. D, E, and J all ran through No density barrier . ne0_TS = 3.5 X 10^20. Move J-port pulse to (1.25 - 1.5 sec.) |
| Dec 20 2000 02:29:53:343PM | 1001220016 | Paul Bonoli | 1001220016 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (1.00 MW) E-port on from 0.7 - 1.5 sec. (1.00 MW) Turn J-port on from 1.25-1.5 sec (800 kW) Result: Got a long EDA H-mode phase wit a very late disruption (1.58 sec) D, E, and J all ran through. ne0_TS increases to 5.5 X 10^20 at 1.25 sec and then arrests itself as J-port is turned on. The neutron rate increases from 2.0 -> 4.5 X 10^12. Take this shot again with J-port re-tuned (we only got 600 out of 800 kW of the available forward power because tune). |
| Dec 20 2000 02:32:42:653PM | 1001220017 | Paul Bonoli | 1001220017 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (1.00 MW) E-port on from 0.7 - 1.5 sec. (1.00 MW) Turn J-port on from 1.25-1.5 sec (1 MW) Result: Got a long EDA H-mode phase. D, E ran through but J had problems. ne0_TS increases to 6.5 X 10^20 at 1.25 sec and then mode collapsed because of J-port problems. Take this shot with J-port power increased to 1 MW. |
| Dec 20 2000 02:46:03:937PM | 1001220018 | Paul Bonoli | 1001220018 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (1.00 MW) E-port on from 0.7 - 1.5 sec. (1.00 MW) Turn J-port on from 1.25-1.5 sec (1 MW) Result: Got a long EDA H-mode phase. D, E, and J ran through.. ne0_TS increases to 8.0 X 10^20. Density increase continues through the J-port injection. Nice density barrier. Neutron rate increases from 1.6 to 4.8 X 10^20. Take this shot with J-port power increased to 1.2 MW. |
| Dec 20 2000 03:10:05:390PM | 1001220019 | Paul Bonoli | 1001220019 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (1.00 MW) E-port on from 0.7 - 1.5 sec. (1.00 MW) Turn J-port on from 1.25-1.5 sec (1 MW) Result: Got a long EDA H-mode phase, but not as good as previous shot (018). Some "event" occurred at 1.35 sec., spoiling the density rise. ne0_TS increases to 5.3 X 10^20 (density barrier ??) Neutron rate increases from 1.8 to 6.8 X 10^20. Reduce J-port power to 1.0 MW and take 4-5 shots for a HIREX scan of the T_i and rotation profiles. |
| Dec 20 2000 03:33:52:733PM | 1001220020 | Paul Bonoli | 1001220020 Take 4-5 shots with to measure T_i and rotation profiles with HIREX Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (1.00 MW) E-port on from 0.7 - 1.5 sec. (1.00 MW) Turn J-port on from 1.25-1.5 sec (1 MW) Result: Got a long EDA H-mode phase, until an event at 1.41sec. ne0_TS increases to 7.4 X 10^20 - a nice density barrier. Take another shot like this with a different aim for HIREX |
| Dec 20 2000 03:52:33:060PM | 1001220021 | Paul Bonoli | 1001220021 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (1.00 MW) E-port on from 0.7 - 1.5 sec. (1.00 MW) Turn J-port on from 1.25-1.5 sec (1 MW) Result: Got a long EDA H-mode phase - another nice barrier mode. ne0_TS increases to 5.2 X 10^20 and neutron rate triples. Take another shot like this with a different aim for HIREX |
| Dec 20 2000 04:12:17:700PM | 1001220022 | Paul Bonoli | 1001220022 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (1.00 MW) E-port on from 0.7 - 1.5 sec. (1.00 MW) Turn J-port on from 1.25-1.5 sec (1 MW) Result: Got an EDA H-mode phase, but it was terminated by a disruption at 1.3 sec. Even so, ne0_TS was 5.4 X 10^20 before the density collapse. Take shot again for HIREX. |
| Dec 20 2000 04:57:12:483PM | 1001220024 | Paul Bonoli | 1001220024 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (1.00 MW) E-port on from 0.7 - 1.5 sec. (1.00 MW) Turn J-port on from 1.25-1.5 sec (1 MW) Result: Got an EDA H-mode phase until disruption occurred at 1.43 sec. ne0_TS = 7.3 X 10^20. This shot was strange because there was no real signature of any J-port heating. The neutron rate hardly changed. A nice density barrier did form however. Take final shot with J-port turned on from 1.0 - 1.5 sec. at 1 MW and (D,E) powers reduced to 1.5 MW total. |
| Dec 20 2000 05:06:48:013PM | 1001220025 | Paul Bonoli | 1001220025 Request: B_t=4.5T, nl_04=0.75, I_p=800 kA D-port on from 0.7 - 1.5 sec. (0.75 MW) E-port on from 0.7 - 1.5 sec. (0.75 MW) Turn J-port on from 1.0 - 1.5 sec. (1.0 MW) Result: Didn't get an H-mode until the J-port power was turned on at 1 sec. I didn't request enough power from D & E ports to put the plasma into H-mode before J-port turned on. End of run |
| Physics Operator Comments | |||
| Dec 20 2000 08:45:27:593AM | Jim Irby | Did REMCAM shot: 1001219015 Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 1.9882 -13.5767 -31.7358 -119.9599 dIp/dt (kA/ms): -1.2705 -3.4357 -4.3247 -7.8864 pressure (mTorr): 0.0678 0.0670 0.0656 0.0599 Bz0 (mT): -3.1845 -0.8494 1.1673 21.3052 Br0 (mT): -0.8211 -0.9882 -0.9695 -1.7208 Startup from yesterday not too bad Did coldstart: rtnode -- data loaded, A matrix responds rtnode -- data loaded, M matrix responds rtnode -- data loaded, PID matrix responds RT_NODE Done 20-DEC-2000 07:47:43.57 Loaded shot 1001214015 into segment 02 Loaded shot 1001219015 into segment 01 Argon enabled for the first shot from 0.350 to 0.390 s | |
| Dec 20 2000 09:10:12:577AM | 1001220001 | Jim Irby | Plasma to rampdown All antennas running Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 1.9882 -13.5767 -29.1417 -96.6125 dIp/dt (kA/ms): -1.5271 -3.1780 -3.4357 -5.8507 pressure (mTorr): 0.0634 0.0634 0.0656 0.0670 Bz0 (mT): -3.8615 -2.2658 -0.5532 20.8932 Br0 (mT): -0.9079 -0.4504 -0.9242 -1.7569 gas looks good, bz?? current rise close to yesterday's HtoD 4% |
| Dec 20 2000 09:21:05:437AM | 1001220002 | Jim Irby | Repeat with more RF power Plasma to rampdown RF looks great |
| Dec 20 2000 09:38:47:903AM | 1001220003 | Jim Irby | Repeat loast plasma at 1.38 s, injection or two |
| Dec 20 2000 09:55:13:373AM | 1001220004 | Jim Irby | Repeat PCS Longer j-port RF plasma to rampdown, but multiple h-modes |
| Dec 20 2000 10:16:17:670AM | 1001220005 | Jim Irby | Repeat, but allowing 15 minutes after last shot -- a little better cleanup from disruption (shot 03) Plasma to rampdown, fewer h-mode transitions |
| Dec 20 2000 10:32:53:060AM | 1001220006 | Jim Irby | Raised NL_Zmeter by about 10% from 0.32 to 0.36 --- try to get into eda sooner Plasma to 1.52 s --- only one extra h-mode transition --- looks much better Time (ms): 0 5 10 25 ---------------------------------------- % Compiled module: DERIV. Ip (kA): -0.5832 -16.1709 -34.3300 -119.9599 dIp/dt (kA/ms): -1.6531 -3.4346 -3.8149 -8.1397 pressure (mTorr): 0.0725 0.0701 0.0742 0.0634 Bz0 (mT): -2.7939 -1.2496 0.2830 21.0715 Br0 (mT): 0.0206 -0.9768 -1.2520 -1.7300 gas getting a little high |
| Dec 20 2000 10:54:58:687AM | 1001220007 | Jim Irby | Reduced prepuff by 2 ms ECDC in D2 at 2e-4 Torr for 5 minutes Reduced argon puff by 5 ms Plasma to rampdown Still had elm-free period early --- Wolfe now suggesting triangularity adjustment |
| Dec 20 2000 11:19:51:543AM | 1001220008 | Jim Irby | 5 minutes of ECDC again Decreased RXU a little from 0.4 s to 0.678 s to increase triangularity Plasma to rampdown, but still two transitions |
| Dec 20 2000 11:37:02:843AM | 1001220009 | Jim Irby | Repeat PCS but now with j-port during whole RF period Note that HtoD has been creeping up: last shot 5-6% Plasma to rampdown --- looks like j-port helped --- will extend it next shot |
| Dec 20 2000 11:55:16:263AM | 1001220010 | Jim Irby | Extended j-port pulse width across entire RF pulse plasma to rampdown; still have back transition |
| Dec 20 2000 12:07:07:747PM | 1001220011 | Jim Irby | Repeat PCS --- Reduce d and e power: assume that too much RF power is generating impurities (moly). Moly killing us faster than we can increase RF power. plasma, transitions worse |
| Dec 20 2000 12:35:37:717PM | 1001220012 | Jim Irby | Bring power back up and raise density NL_Zmeter from 0.36 to 0.7 Asked for 10 minutes of ECDC for this shot Init started about 20 minutes after last shot Plasma to rampdown, but I forgot to load the density change!!! |
| Dec 20 2000 01:02:20:607PM | 1001220013 | Jim Irby | Loaded density changed I claimed for shot 11 Have asked for ECDC between every shot from shot 12 on --- 5 minutes D2 Plasma to rampdown. Got higher target density. Beautiful EDA but didn't have d-port RF --- tuning?? |
| Dec 20 2000 01:25:23:000PM | 1001220014 | Jim Irby | Repeat PCS plasma to 1.85 s One EDA h-mode with ITB formation --- things are looking up Next shot will add j-port again |
| Dec 20 2000 01:55:39:310PM | 1001220015 | Jim Irby | Only change is addition of j-port power plasma to 1.75 s, nice eda h-mode, very little peaking of density --- j-port?? Very clean 2.8 MW RF pulse |
| Dec 20 2000 02:10:58:577PM | 1001220016 | Jim Irby | Increased argon puff by 5 ms plasma to 1.57 s good eda with increasing peaking until j-port turned on |
| Dec 20 2000 02:32:44:543PM | 1001220017 | Jim Irby | Repeat with more j-port power plasma to 1.75 s faults on j HtoD under control; 5% or so |
| Dec 20 2000 02:45:32:983PM | 1001220018 | Jim Irby | More j-port plasma to 1.61 s nice h-mode, peaking looks good, nice RF power all antennas |
| Dec 20 2000 03:15:52:327PM | 1001220019 | Jim Irby | A little more j-port power plasma to 1.59 3.2 MW RF --- nice clean RF all antennas Instability seems to kill neutron rate at "last" sawtooth. x-ray centroids oscillate at +- 1-2 cm level. |
| Dec 20 2000 03:32:53:890PM | 1001220020 | Jim Irby | Next several shots will be Ti profile measurements Plasma to 1.73 s HtoD 4 to 5% |
| Dec 20 2000 03:52:39:093PM | 1001220021 | Jim Irby | Plasma for 1.52 s, saw a UFO on wide angle view at end beautiful RF pulses: 3 MW 4 to 5% HtoD Locked mode alert at 1.4 s |
| Dec 20 2000 04:22:09:200PM | 1001220022 | Jim Irby | plasma to 1.31 s, big injections at 1.18 and 1.28 s |
| Dec 20 2000 04:32:14:920PM | 1001220023 | Jim Irby | plasma to 1.75 s, but lost eda by 1.29 s with injection/impurity increase. |
| Dec 20 2000 04:54:53:577PM | 1001220024 | Jim Irby | plasma to 1.43 s got some j-port info |
| Dec 20 2000 05:02:24:640PM | 1001220025 | Jim Irby | j-port on earlier (1 s) plasma to 1.76 s d and e power too low to get h-mode, h-mode at 1 s with j-port |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:57:53:810AM | Plasma | Ok | |
| 2 | 09:11:57:560AM | Plasma | Ok | |
| 3 | 09:28:32:247AM | Plasma | Ok | |
| 4 | 09:43:54:360AM | Plasma | Ok | |
| 5 | 10:02:42:357AM | Plasma | Ok | |
| 6 | 10:21:04:217AM | Plasma | Ok | |
| 7 | 10:42:41:403AM | Plasma | Ok | |
| 8 | 11:04:32:030AM | Plasma | Ok | |
| 9 | 11:22:42:780AM | Plasma | Ok | |
| 10 | 11:42:45:733AM | Plasma | Ok | |
| 11 | 12:01:50:827PM | Plasma | Ok | |
| 12 | 12:28:31:077PM | Plasma | Ok | |
| 13 | 12:49:54:060PM | Plasma | Ok | |
| 14 | 01:10:29:843PM | Plasma | Ok | |
| 15 | 01:34:25:187PM | Plasma | Ok | |
| 16 | 01:55:11:310PM | Plasma | Ok | |
| 17 | 02:16:14:937PM | Plasma | Ok | |
| 18 | 02:36:19:107PM | Plasma | Ok | |
| 19 | 02:55:28:653PM | Plasma | Ok | |
| 20 | 03:17:30:733PM | Plasma | Ok | |
| 21 | 03:38:19:640PM | Plasma | Ok | |
| 22 | 03:58:48:513PM | Plasma | Bad | OH2L Type 1 Fault |
| 23 | 04:19:55:340PM | Plasma | Ok | |
| 24 | 04:39:13:420PM | Plasma | Ok | |
| 25 | 04:58:18:780PM | Plasma | Ok | |